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I think that it is functioning just as an old school design might.

There are lots of semi-pro equalizers that can do about the same thing. But with more bands and independent Left & Right band controls.

In olden times, the AVSforum 'Dedicated Theater Design and Construction' section and almost daily posts on this subject. https://www.avsforum.com/forums/dedicated-theater-design-construction.19/

That's a poor assumption, HAMs follow the rules. All interconnect cables need a heavy braided shield. Plug everything into the same AC wall outlet. * * * * * * * * * * * * * * * * Jim Brown, retired Audio Engineering Society interference expert, is also a HAM radio operator. He has several...

Audio Engineering Society paper: MEASURING ACOUSTIC NOISE EMITTED BY POWER TRANSFORMERS Menno van der Veen (Plitron Transformers) https://www.idc-online.com/technical_references/pdfs/electrical_engineering/MEASURING_ACOUSTIC_NOISE_EMITTED_BY_POWER.pdf

Do gliders show up on "Flight Tracker" type programs?

Some Jim Brown (see post #6) papers on chokes & ferrites: RFI, Ferrites, and Common Mode Chokes For Hams http://www.audiosystemsgroup.com/RFI-Ham.pdf RF Interference in Audio Systems http://www.audiosystemsgroup.com/AES-RFI-SF08.pdf Understanding How Ferrites Can Prevent and Eliminate RF...

If you do go with snap-on ferrite cores, place them as close to the chassis as practicable. The molded one piece cores with a hole thru the center are better, but that ship as sailed.

Get a "Kill-a-Watt" (or similar) AC power meter and check for high AC line voltage.

XLR pin 1 is the shield not a 'ground". True in most balanced output stages it has continuity to the audio circuit common. So in these cases, pin 2 and/or pin 3 to pin 1 may be half the signal level of pin2 to pin 3. But it's not true in some cases.

a] plug everything into the same AC wall outlet. b] braided shields on all interconnect cables. c] try short twisted pair loudspeaker cables. * * * * * * * * * * * When all else fails, Jim Brown retired Audio Engineering Society interference expert, has several papers & Power Points on this...

a] Is it 24 by 7 all year long? b] sometimes high AC line voltage can cause this type of problem.

The diyAudio forum is more active on this type of thread. https://www.diyaudio.com/community/forums/power-supplies.67/

The above measurement assumes a correctly wired AC power circuit. No swapped wires, no bootleg grounds. Those little 3 LED testers won't catch most of those problems.

Well you could attach (bond) it to the wall outlet, that would be safe. But it's more effective to attach it to an audio component in the same system. From an audio point of view having all the chassis's at the same potential is more productive.

a Class II double insulated device that has a total plastic enclosure, should not be modified to ground its internal metal chassis. But if the amp has an exposed metal chassis, that means that just the power supply is double insulated. That phono ground lug can be connected to the chassis of...

The AC power supply is double insulated from the metal chassis. So scrape the paint under a screw off, and run a wire to the metal chassis of another component (with a metal chassis) that has a 3 wire cord.

Does the A-760 have an exposed metal chassis or is totally enclosed in plastic?

The chart in post #21 looks weird. The first two, don't look like balanced outputs. The last 3 have nonexistent ground terminals.

In the 'home theater' section of many big-box stores, you may see Copper Clad Aluminum loudspeaker cables. Often with old major brand names.